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Prince William and Kate, the Duke and Duchess of Cambridge, are greeted by Los Angeles Mayor Antonio Villaraigosa, center left, as they arrive at Los Angeles International Airport in Los Angeles on Friday, July 8, 2011. (AP Photo/Jae C. Hong)

Prince William and Kate, the Duke and Duchess of Cambridge, are greeted by Los Angeles Mayor Antonio Villaraigosa, center left, as they arrive at Los Angeles International Airport in Los Angeles on Friday, July 8, 2011. (AP Photo/Jae C. Hong)